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OK - Seems as though that is going to be the approach...however this tunnel will be a quarter circle, so don't know how to make the pvc pipe work with either a 8' or 10' diameter track... <br /> <br />Will dig a trench..fill with gravel/sand/ and then put thin cinder blocks on each side...may need to mortar them in. I'll put crusher fines like normal as ballast, and than may try and get some sort of plastic/pvc for the top that can just be covered with mulch...would like some way of removing the top in case the trains get stuck as it will be about 6-8 feet long. Seems like I got my next few weekends work cut out!
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